Article
Optics
M. Isik, N. Sarigul, N. M. Gasanly
Summary: This paper reports deep defect centers in GaSe and Ga2Se3 single crystals grown by the Bridgman method, which have significant effects on the quality of semiconductor devices. The thermoluminescence measurements and x-ray diffraction measurements reveal the trap activation energies and crystalline structural properties of the grown single crystals, respectively.
JOURNAL OF LUMINESCENCE
(2022)
Article
Chemistry, Multidisciplinary
Gennadiy Nikolaevich Kozhemyakin
Summary: In this study, single crystals of Bi and Bi1-xSbx were grown using the Czochralski technique, and the influence of various parameters on the crystal growth was investigated. It was found that a low temperature gradient resulted in a corrugated surface, while a high temperature gradient caused internal stress and cracks in the crystal. By adding Sb, the growth parameters could be optimized for Bi1-xSbx alloys, allowing for better control of crystal properties. This technique is valuable for the study and application of Bi and Bi1-xSbx single crystals.
Article
Materials Science, Multidisciplinary
L. Yin, Y. Wang, L. Pan, M. Zhang, Y. Li, J. Yang, X. Lu, P. D. Townsend
Summary: In this study, a series of Ca2.97-xSrxGa4O9: 3mol% Bi3+ phosphors were prepared and characterized for their applications in W-LEDs, temperature sensing, long persistent materials and anti-counterfeiting. The samples were analyzed using XRD, photoluminescence, and 3D thermoluminescence spectra. The results showed that Bi3+ ions occupied different Ca sites with varying coordination, leading to sequential adjustments in photoluminescence spectra when strontium ions were introduced. A detailed analysis of trap intensity variation and energy transfer between traps and luminescence centers was also conducted using 3D thermoluminescence with cation substitution.
Article
Chemistry, Multidisciplinary
Wilmer Velilla-Diaz, Habib R. Zambrano
Summary: Molecular dynamics simulations of cracked nanocrystals of aluminum were conducted to investigate the effects of crack length and grain boundaries. Results showed that the grain boundary had a beneficial effect on fracture resistance, increasing fracture toughness by almost four times for bi-crystals.
Article
Chemistry, Physical
Janusz Winiecki, Sandra Witkiewicz-Lukaszek, Paulina Michalska, Seweryn Jakubowski, Sergiy Nizhankovskiy, Yuriy Zorenko
Summary: Thermostimulated luminescence (TSL) dosimetry is a versatile tool for assessing ionizing radiation dose. The Ce3+ doped Y3Al5O12 garnet (YAG:Ce) has emerged as a potential TSL material in radiotherapy due to its radiation stability, uniform properties, high TSL yield, and favorable glow peak position. It has shown promising results for detecting X-ray radiation from a clinical accelerator with a 6 MV beam, and further research is being conducted using garnet crystals with higher density for evaluating X-rays from a 15 MV beam.
Review
Chemistry, Physical
Sandra Witkiewicz-Lukaszek, Vitalii Gorbenko, Tetiana Zorenko, Yurii Syrotych, Jiri A. Mares, Martin Nikl, Oleg Sidletskiy, Pawel Bilski, Akira Yoshikawa, Yuriy Zorenko
Summary: This manuscript summarizes recent developments in composite luminescent materials based on single-crystalline films and single crystals of simple and mixed garnet compounds. These materials have potential applications in radiation monitoring and microimaging techniques. The study includes optical characterization and investigation of scintillation and TL properties under different radiation excitations. The most efficient variants of composite scintillation and TL detectors for monitoring of mixed beams of ionizing radiation were selected based on the results of this study.
Article
Chemistry, Physical
Sandra Witkiewicz-Lukaszek, Anna Mrozik, Vitaliy Gorbenko, Tetiana Zorenko, Pawel Bilski, Yurii Syrotych, Yuriy Zorenko
Summary: This work focuses on the development of new composite thermoluminescent detectors using Ce-doped GdAlO3 perovskite single crystalline films and Mn-doped YAlO3 and (Lu0.8Y0.2)AlO3:Mn perovskites, as well as Ce and Pr-doped YAlO3 single crystal substrates. The detectors were obtained through Liquid Phase Epitaxy growth method. The study explores the differences in thermoluminescent glow curves recorded from the film and crystal parts of epitaxial structures for simultaneous registration of mixed ionization fluxes. Among the compositions studied, the GdAlO3:Ce film/YAlO3:Ce crystal epitaxial structure showed the best properties for the simultaneous thermoluminescent detection of alpha- and X-rays.
Article
Multidisciplinary Sciences
Chansun Park, Sangsu Kim, Alima Melis, Wonhi Lee, Abdallah Elmughrabi, Shinhaeng Cho, Jung-Yeol Yeom
Summary: We investigated the correlation between surface finish and luminescence properties of chemically polished cerium-doped single-crystal Gd3Al2Ga3O12 scintillators (Ce:GAGG) from a crystallographic perspective. Intrinsic defects were identified using photoluminescence spectroscopy, scanning electron microscopy, and X-ray diffraction to analyze surface morphologies. The chemically polished Ce:GAGG single-crystal samples showed a 33.1% increase in signal amplitude and a 2.4% improvement in energy resolution, comparable to mechanically polished samples. The chemical polishing method used in this study is cost-effective and straightforward for improving structural imperfections in inorganic scintillators.
Article
Materials Science, Ceramics
Ziyafer Gizem Portakal-Ucar, Sibel Akca-Ozalp, Mehmet Oglakci, Aya Barad, Mustafa Topaksu
Summary: The thermoluminescence properties and kinetics of beta-irradiated porcelain used as an electrical insulator were extensively studied in this work. The trap system in the material was slightly altered after thermal annealing at 1100°C, while heating above 500°C increased the visual TL intensity. Various characterization techniques confirmed the structural, morphological, and chemical properties of the porcelain. The TL glow curve characteristics, repeatability, storage time properties, and dose-response behavior were thoroughly investigated. The results showed that the porcelain exhibited excellent reusability within the confidence interval and demonstrated linear response in the dose range of 0.1-3 Gy.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Multidisciplinary
I. N. Ogorodnikov, V. A. Pustovarov, L. I. Isaenko, S. I. Lobanov
Summary: The study investigated the optical absorption and luminescence spectra of pristine and electron-beam irradiated SrMgF4 crystals, analyzing the effects of irradiation on their properties. Temperature dependence of luminescence intensity and low-temperature thermoluminescence of irradiated crystals were also examined.
Article
Physics, Applied
A. Ardenghi, O. Bierwagen, A. Falkenstein, G. Hoffmann, J. Laehnemann, M. Martin, P. Mazzolini
Summary: The issues related to oxidation in controlling Si doping in oxide molecular beam epitaxy (MBE) were addressed by substituting solid suboxide SiO as an alternative source material. The SiO molecules were found to sublime with an activation energy of 3.3 eV. Si-doped β-Ga2O3 layers were successfully grown using this source, demonstrating unprecedented control over Si doping concentration. However, the presence of activated oxygen resulted in partial source oxidation and a decrease in doping concentration.
APPLIED PHYSICS LETTERS
(2022)
Article
Crystallography
Jinfeng Liu, Guisheng Xu, Xiu Zhu, Meilin Chen
Summary: In this study, Mn-doped BMT-PT single crystals were grown using a flux method. The crystals were irregular in shape and ranged in size from 4 to 10 mm. The results showed that as the temperature increased, the rhombohedral phase directly transformed into the cubic phase. The Mn-doping significantly improved the piezoelectric properties of the crystals.
Article
Optics
Yingying Chen, Qingli Zhang, Haotian Zhang, Jinyun Gao, Yi He, Yuxi Gao, Lili Zheng, Fan Yang, Xiaofei Wang, Renqin Dou, Chen Peng
Summary: A high-quality Zr:GdTaO4 single crystal was successfully synthesized for the first time by the Czochalski method, with a density of 8.84 g/cm3, higher than the well-known dense scintillator PbWO4. The segregation coefficient of Zr in Zr:GdTaO4 is 0.288. The light yield and energy resolution of Zr:GdTaO4 are comparable to GdTaO4. Zr:GdTaO4 has a scintillation decay time with a fast decay component of 9.51 ns, similar to the fast scintillator PbWO4, and a slow decay component of 755.61 ns, which is much faster than that of GdTaO4.
JOURNAL OF LUMINESCENCE
(2023)
Article
Chemistry, Multidisciplinary
Woong Young So, Sikandar Abbas, Qi Li, Rongchao Jin, Linda A. Peteanu
Summary: Silicon nanoparticles with surface modifications exhibit fluorescence properties with emission wavelengths ranging from cyan to yellow. The emission is predominantly derived from charge-transfer transitions, with the red emission region showing collective or bi-excitonic character and the yellow emission exhibiting CT character. Deposition of the sample onto a thin gold film affects the emission properties of the Si nanoparticles.
Article
Materials Science, Multidisciplinary
Claudia Angelica Marquez-Mata, Hector Rene Vega-Carrillo, Ma Jesus Mata-Chavez, Mayra Guadalupe Garcia-Reyna, Joel Vazquez-Banuelos, Guillermo Eduardo Campillo-Rivera, Angel Garcia-Duran, Carina Oliva Torres-Cortes, Ileana Rosales-Candelas, Juan Jose Soto-Bernal
Summary: The thermoluminescent response of seven varieties of quartz to gamma rays was studied, and it was found that some of the quartz varieties have characteristics to be used as dosimeters.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Physics, Multidisciplinary
M. Isik, N. M. Gasanly, N. H. Darvishov, V. E. Bagiev
Summary: The structural and optical properties of PbWO4 single crystals grown by the Czochralski method were investigated using X-ray diffraction and transmission experiments. The X-ray diffraction pattern showed distinct and strong peaks associated with the tetragonal scheelite structure. Transmission experiments were performed for the first time at various temperatures (10 to 300 K) on PbWO4 single crystals to examine the temperature dependence of the band gap. The derivative spectroscopy method revealed an increase in the experimentally observed band gap energy from 3.20 to 3.35 eV as the temperature decreased from room temperature to 10 K.
Article
Optics
S. Delice, M. Isik, N. M. Gasanly
Summary: This study investigated the structural, optical, and thermoluminescence properties of TlGaS2 single crystals, revealing their potential applications in 2D structures. The crystal exhibited a monoclinic unit cell structure with distinct peaks in the XRD pattern, while the band gap and Urbach energies were determined to be 2.57 and 0.25 eV, respectively. Thermoluminescence measurements showed a TL peak with a maximum temperature of 573 K, indicating the presence of a deep trapping level with an activation energy of around 0.92 eV. Additionally, the TL peak temperature was found to shift towards higher temperatures with increasing heating rates.
JOURNAL OF LUMINESCENCE
(2022)
Article
Nanoscience & Nanotechnology
Mehmet Isik, Makbule Terlemezoglu, Nizami Gasanly, Mehmet Parlak
Summary: In this study, CuS thin films were produced by RF magnetron sputtering method, and their structural, morphological, and optical characteristics were investigated. The results showed that the CuS films had a nano-flake structure and exhibited direct and narrow bandgap energy, making them suitable for optoelectronic and photocatalysis applications.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2022)
Article
Optics
Yasemin Pepe, Mehmet Isik, Ahmet Karatay, Nizami Gasanly, Ayhan Elmali
Summary: This study reports the influence of excitation wavelength and input intensity on the nonlinear absorption mechanism and optical limiting behavior of the Bi12TiO20 (BTO) single crystal. The results show that the BTO single crystal has nonlinear absorption ability and the absorption coefficient varies with the excitation wavelength and input intensity.
JOURNAL OF LUMINESCENCE
(2023)
Article
Engineering, Electrical & Electronic
I. Guler, M. Isik, N. Gasanly
Summary: Layered semiconductor materials are the focus of recent research due to their effective optical properties. This article examines the structural, morphological, and optical properties of Tl2In2S3Se thin films grown by thermal evaporation. Results from XRD, EDS, and AFM techniques reveal a well-defined monoclinic crystalline structure, atomic compositional ratios consistent with the chemical formula, and vibrational modes of the thin film. Transmission and Raman spectroscopy techniques provide information about the band gap energies and Urbach energy of the thin film.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Materials Science, Multidisciplinary
M. Isik, N. M. Gasanly, N. H. Darvishov, V. E. Bagiev
Summary: This paper reports the structural and optical properties of PbMo0.75W0.25O4 single crystals grown by Czochralski method. The crystal exhibited well-defined diffraction peaks and a tetragonal crystalline structure. Raman and infrared spectra were used to study the vibrational characteristics, with Raman modes associated with PbMoO4 and PbWO4 and eight bands observed in the infrared spectrum. The transmission spectrum revealed a direct band gap energy of 3.12 +/- 0.03 eV and a linear behavior of composition-band gap energy for PbMo1-xWxO4 compounds.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Engineering, Electrical & Electronic
M. Isik, N. M. Gasanly
Summary: This paper investigates the linear and nonlinear optical properties of Bi12GeO20 single crystals grown by the Czochralski method. Transmission and reflection measurements were carried out in the 400-1000 nm range, and the obtained spectra were analyzed using well-known optical models. The spectral dependencies of the absorption coefficient, refractive index, and dielectric function were presented. The results also include the analysis of the absorption coefficient and the determination of the nonlinear susceptibilities and refractive index of the crystal.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2023)
Article
Physics, Multidisciplinary
M. Isik, I Guler, N. M. Gasanly
Summary: The structural and optical properties of the double sodium-bismuth molybdate NaBi(MoO4)(2) semiconductor compound were investigated using X-ray diffraction, Raman, and transmission experiments. The crystal exhibited a tetragonal structure according to the X-ray diffraction results. The vibrational modes of the crystal were identified through Raman experiments. Transmission experiments were conducted in the temperature range of 10-300 K. Derivative spectroscopy and absorption spectrum analysis showed consistent results regarding the change in band gap energy of the crystal with temperature. The absorption spectrum obtained from transmission measurements at varying temperatures revealed the absolute zero value of the band gap energy as 3.03 +/- 0.02 eV, the average phonon energy as Eph = 24 +/- 0.2 meV, and the Urbach energy of the crystal as 0.10 eV.
Article
Materials Science, Multidisciplinary
S. Delice, M. Isik, N. M. Gasanly
Summary: Thermally stimulated current (TSC) experiments were performed on Bi12GeO20 single crystals, revealing the existence of trapping levels and their activation energies in the recorded glow curve. The TSC intensity decreased and the peak maximum temperature increased with increasing heating rate.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
I. Guler, M. Isik, N. Gasanly
Summary: The optical properties of TlIn(S0.25Se0.75)(2) crystals were investigated using ellipsometry measurements. The crystal exhibited well-defined peaks in the X-ray diffraction pattern, indicating a monoclinic structure. Energy dependence of various linear optical parameters in the range of 1.25-4.50 eV were analyzed. The compound's band gap and Urbach energies were determined to be 1.96 and 0.68 eV, respectively, through analysis of the absorption coefficient. The refractive index spectrum was analyzed using the single-effective-oscillator model to obtain oscillator and dispersion energies, dielectric constants, and plasma frequency. Additionally, the present study revealed the nonlinear refractive index, first-order, and third-order nonlinear susceptibilities of the TlIn(S0.25Se0.75)(2) crystal.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2023)
Article
Engineering, Electrical & Electronic
M. Isik, I. Guler, N. M. Gasanly
Summary: The structural and optical characteristics of NaBi(Mo0.5W0.5O4)2 single crystals grown by Czochralski method were investigated. The compound exhibited a tetragonal crystalline structure with a space group I41/a. The vibrational properties of the compound were studied using Raman and infrared transmittance spectra. The reported characteristics of NaBi(Mo0.5W0.5O4)2 suggest that it has significant potential for use in optoelectronic devices.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Anil Dogan, Ahmet Karatay, Mehmet Isik, Yasemin Pepe, Nizami Gasanly, Ayhan Elmali
Summary: Nonlinear absorption mechanisms, excitation wavelength dependence, and defect states of Bi12SiO20 (BSO) single crystal were investigated. The NA behavior decreased with increasing pump intensity as the defect states at around 2.32 eV by one photon absorption (OPA) at 532 nm and two photon absorption (TPA) at 1064 nm excitations. The dominant NA mechanisms are OPA and sequential TPA at 532 nm as compared to the 1064 nm. A higher NA coefficient was obtained at 532 nm as compared to 1064 nm excitation, attributed to higher contribution of OPA at 532 nm even at lower input intensities compared to TPA contribution at 1064 nm. Onset optical limiting thresholds were found as 0.34 and 0.68 mJ/cm2 for 532 and 1064 nm input beams, respectively. The BSO single crystal may be used as a saturable absorber or an optical limiter at convenient input intensity by effectively adjusting defect states and excitation wavelength.
Article
Physics, Multidisciplinary
Yasemin Pepe, Elif Akhuseyin Yildiz, Mehmet Isik, Ahmet Karatay, Nizami Gasanly, Ayhan Elmali
Summary: The compositional effect of Mo/W ratio on linear, nonlinear absorption and optical limiting behavior of NaBi(MoxW1-xO4)(2) single crystals was investigated. The crystal structure, nonlinear absorption parameters, and optical limiting properties were determined. The results showed that the Mo/W ratio can tune the defect states and significantly affect the nonlinear absorption and optical limiting behaviors, making these single crystals suitable for optoelectronic applications.
Article
Physics, Condensed Matter
M. Isik, I. Guler, N. Gasanly
Summary: In this study, the linear and nonlinear optical properties of layered single crystals of Tl2In2S3Se were investigated using ellipsometry measurements. Various optical parameters were determined through analysis.
PHYSICA B-CONDENSED MATTER
(2023)
Article
Multidisciplinary Sciences
Neslihan Sarigul, Leyla Bozatli, Ilhan Kurultak, Filiz Korkmaz
Summary: This study investigates the diagnostic potential of Attenuated Total Reflectance-Fourier Transform Infrared (ATR-FTIR) spectroscopy in children with Autism Spectrum Disorder (ASD). The results show differences in urine components between children with ASD and typically developing children, suggesting that ATR-FTIR can serve as a practical method for screening ASD.
SCIENTIFIC REPORTS
(2023)
Article
Optics
R. B. Adamov, G. A. Melentev, I. V. Sedova, S. V. Sorokin, G. V. Klimko, I. S. Makhov, D. A. Firsov, V. A. Shalygin
Summary: This study investigates the THz luminescence in doped nanostructures with GaAs/AlGaAs quantum wells under interband optical pumping. The results show that the spatial separation of donors and acceptors can greatly enhance the integrated intensity of THz emission.
JOURNAL OF LUMINESCENCE
(2024)
Article
Optics
Yanru Li, Lei Zhong, Sha Jiang, Yutong Wang, Binyao Huang, Guotao Xiang, Li Li, Yongjie Wang, Chuan Jing, Xianju Zhou
Summary: In this study, a ratiometric luminescent thermometry based on dual-emission centers was developed using co-doped CaNb2O6 phosphors with Bi3+ and Pr3+. The obtained samples exhibited good thermosensitive and thermochromic characteristics, with a maximum absolute sensitivity of 0.09 K-1 @ 528 K and a maximum relative sensitivity of 2.17 % K-1 @ 453 K.
JOURNAL OF LUMINESCENCE
(2024)
Article
Optics
Yujing Gong, Yeqing Wang, Zhiyuan Wang, Yijian Sun, Yi Yu
Summary: Single crystals of Dy3+ single-doped and Dy3+/Tb3+ co-doped CaYAlO4 were grown and analyzed. The incorporation of Tb3+ resulted in increased absorption and emission cross sections. The fluorescence lifetimes and branching ratios of the yellow emission were affected by the presence of Tb3+. The deactivation effect of Tb3+ ions and energy transfer mechanism were also discussed.
JOURNAL OF LUMINESCENCE
(2024)
Article
Optics
Lu Chen, Zhuangzhuang Ma, Jian Chen, Wang Guo
Summary: This study focuses on enhancing the thermal robustness of phosphor converter materials by preparing composite ceramics of YAG:Ce combined with high-thermal-conductivity MgO. The composite ceramics showed high density and thermal conductivity at the optimum temperature of 1400℃. Stable laser-driven white light was obtained under blue laser excitation.
JOURNAL OF LUMINESCENCE
(2024)
Article
Optics
Yuwei Wu, Chunhui Niu, Lei Wang, Mingqing Yang, Shiyu Zhang
Summary: Er3+-doped germanate-tellurite glasses were prepared and their structure, luminescent, and temperature-sensing properties were studied. The glass exhibited large values of O2 and O6 and its luminescence intensity varied with temperature.
JOURNAL OF LUMINESCENCE
(2024)
Article
Optics
Kensei Ichiba, Takumi Kato, Kenichi Watanabe, Yuma Takebuchi, Daisuke Nakauchi, Noriaki Kawaguchi, Takayuki Yanagida
Summary: In this study, Eu-doped YVO4 single crystals with different concentrations were fabricated to evaluate their photoluminescence and scintillation properties. The results showed that the samples doped with Eu exhibited emission peaks due to 4f-4f transitions in PL and scintillation spectra. Based on the pulse height spectra, the light yield of the Eu-doped samples increased with increasing Eu concentration, while the afterglow level decreased.
JOURNAL OF LUMINESCENCE
(2024)
Article
Optics
Daiwen Xiao, Hei-Yui Kai, Anjun Huang, Menglin Song, Ka-Leung Wong, Peter A. Tanner
Summary: The emission spectra of Cs2NaEuCl6 nanoparticles synthesized by the hot injection method are explained. The dispersion of the nanoparticles in alkane solvents in the experiment allows the determination of the magnetic dipole radiative rate for the D-5(0) -F-7(1) channel in vacuum, which is in agreement with the calculated value.
JOURNAL OF LUMINESCENCE
(2024)
Article
Optics
Italia V. Barbosa, Geraldine Dantelle, Alain Ibanez, Lauro J. Q. Maia
Summary: The thermal response and luminescence properties of different oxide matrices were evaluated to design more accurate thermal probes. It was found that thermal probes emitting in BW-II provide better thermal sensing with higher signal-to-noise ratio. Additionally, doping Nd3+ in Y2O3 matrix maximizes luminescence intensity, making it a promising matrix for thermal sensing.
JOURNAL OF LUMINESCENCE
(2024)
Article
Optics
Xin Li, Yu Zhang, Hongrui Ren, Lunlong Xie, Yinsheng Di, Mengqing Han, Zhaohui Bai, Quansheng Liu, Liangliang Zhang, Jiahua Zhang
Summary: This study successfully prepared phosphor samples based on Ca3-xLuxSc2-xMgxSi3O12:Ce3+ and investigated their luminescence properties. With the increase in Lu-Mg concentration, the peak of the sample redshifted, but the thermal stability gradually decreased. The LD devices made from CLSMS:Ce3+ fluorescent materials showed a decrease in cyan-green light and an increase in red light as the Lu-Mg concentration increased.
JOURNAL OF LUMINESCENCE
(2024)
Article
Optics
Tim Pier, Julia Hopster, Thomas Juestel
Summary: This study investigates and reports on several samples of cerium-activated gallium-based garnet phosphors. The optimal activator concentration was found to be 1 atom-%. The size of non-emitting lanthanide ions and the molar concentration of cerium strongly influenced the crystal field splitting, which in turn shaped the excitation and emission wavelengths.
JOURNAL OF LUMINESCENCE
(2024)
Article
Optics
Guijie Zhao, Wei Shi, Xin Xin, Fengcai Ma, Yongqing Li
Summary: This study reveals for the first time the proton transfer pathways and changes in the photophysical properties of P-TNS with three intramolecular hydrogen bonds. The reaction mechanism and driving force for the proton transfer process are explained through analysis of potential energy surface, frontier molecular orbitals, and hydrogen bond parameters, among others.
JOURNAL OF LUMINESCENCE
(2024)
Article
Optics
Li He, Jinshu Huang, Zhengce An, Haozhang Huang, Yu Zhao, Kexin Zhong, Bo Zhou
Summary: In this study, we designed a NaYF4:Yb3+/Tm3+@NaYF4 core-shell nanostructure to achieve thermochromic upconversion and high thermal sensitivity. We found that the blue upconversion emission of Tm3+ decreased while the deep-red emission increased with elevating temperature. The sample also showed a gradual emission color change from blue to purplish-red, and the optimal relative sensitivity reached 2.79% K-1.
JOURNAL OF LUMINESCENCE
(2024)
Article
Optics
Rupesh A. Talewar
Summary: A series of Li2TiO3 phosphors doped with Mn4+ and codoped with Mn4+ and Er3+ were synthesized, which demonstrated the ability of Mn4+ ions to absorb UV-Vis photons and subsequently transfer energy to Er3+ ions, resulting in the emission of near-infrared light. These materials have the potential to enhance the absorption efficiency of Er3+-based luminescent materials.
JOURNAL OF LUMINESCENCE
(2024)
Article
Optics
Xingyuan Ma, Jianfeng Li
Summary: Carbon quantum dots (CQDs) with tunable photoluminescence properties have been synthesized using suitable carbon and dopant sources in an aqueous system. The synthesized CQDs exhibited blue, green, yellow, and red emissions, and solid-state luminescence was achieved through the preparation of solid-state fluorescent films and phosphors. This study provides important technical support for the future development of CQDs synthesis.
JOURNAL OF LUMINESCENCE
(2024)
Article
Optics
De Bin Fu, Yang Bing Xu, Yu Teng Zhang, Shan Ting Liu, Xiao Fei Yang, Sheng Hua Liu
Summary: A pair of new chiral molecules, (S)-4 and (R)-4, have been designed and synthesized by introducing valine-containing groups at symmetrical positions on the periphery of an indolo[3,2-b]carbazole unit. These molecules exhibit aggregation-induced circular dichroism (AICD) properties in DMF/water mixtures, and in a mixture with 99% water fraction, they show strong, mirror-image, blue circularly polarized luminescence (CPL) signals.
JOURNAL OF LUMINESCENCE
(2024)
